Press Release

MADISON, N.J., May 19 /PRNewswire-FirstCall/ -- Patients and physicians
have a new way to share diagnostic laboratory data online, thanks to Quest
Diagnostics and Google Health, a product launched today by Google. More than
100,000 physicians in the U.S. who use Quest Diagnostics' family of
Care360(TM) connectivity products will be able to securely provide diagnostic
data with a brief explanation of test results to a patient's Google Health
Account, where a patient can maintain medical records and personal health
information online. The new product is expected to empower patients and
physicians to collaborate more closely in making more well-informed health
care decisions based on diagnostic information. Quest Diagnostics
Incorporated (NYSE: DGX) is the nation's leading provider of diagnostic
testing, information and services, serving half of all physicians and
hospitals in the U.S. and analyzing test results for more than 500,000
patients every day. Quest Diagnostics is the only diagnostic testing company
collaborating with Google to launch Google Health.

"Diagnostic testing is the foundation of a patient's health record and a
key driver of the health care decisions physicians make on behalf of their
patients," said Stephen C. Suffin, M.D., interim chief laboratory officer and
corporate medical director, clinical pathology, Quest Diagnostics. "Using
Google Health, physicians will be able to more efficiently share important
diagnostic data with their patients. As patients become better informed and
proactive in managing their health care, they may be more likely to practice
preventive care, adopt healthful behaviors and practice other measures that
promote improved medical outcomes."

Google Health allows users to store, organize and manage their medical
records and personal health information online. The collaboration will enable
physicians who use Quest Diagnostics' Care360(TM) patient-centric physician
portal to securely transfer, at a patient's request, diagnostic data in a
HIPAA-compliant format into the patient's protected Google Health Account.
Using Google's secure technology platform, patients will be able to use their
account to access current and historical diagnostic laboratory records that
include brief electronic messages from their physicians about test results.

Quest Diagnostics and Google established their collaboration because the
companies share the same vision of giving patients greater access to personal
health information so they can make more informed decisions about their care.
The companies first announced their collaboration in February 2008, when
Google announced a pilot of Google Health with a large delivery system. The
product is publicly available to all U.S. users starting today.

According to The Markle Foundation, two in three Americans (65 percent)
would like to access all of their medical information electronically to ensure
accuracy, improve doctor-patient communications and help prevent medical
errors. Two-thirds (68 percent) also said having health and medical
information accessible online gives them more control over their own health.

Google Health complements Quest Diagnostics' commitment to physician- and
patient-focused solutions. These include an option for patients to schedule
diagnostic testing online and access to a comprehensive health library,
available at www.questdiagnostics.com. In addition, its Care360 family of
connectivity products allow physicians to access diagnostic test results
online, share clinically relevant information in a HIPAA-compliant manner and
electronically prescribe medications.

About Quest Diagnostics

Quest Diagnostics is the leading provider of diagnostic testing,
information and services that patients and doctors need to make better
healthcare decisions. The company offers the broadest access to diagnostic
testing services through its national network of laboratories and patient
service centers, and provides interpretive consultation through its extensive
medical and scientific staff. Quest Diagnostics is a pioneer in developing
innovative new diagnostic tests and advanced healthcare information technology
solutions that help improve patient care. Additional company information is
available at: www.questdiagnostics.com.

The statements in this press release that are not historical facts or
information may be forward-looking statements. These forward-looking
statements involve risks and uncertainties that could cause actual results and
outcomes to be materially different. Certain of these risks and uncertainties
may include, but are not limited to, competitive environment, changes in
government regulations, changing relationships with customers, payers,
suppliers and strategic partners and other factors described in the Quest
Diagnostics Incorporated 2007 Form 10-K and subsequent SEC filings.